键盘输入年月输出该月日历

for(int g=0;g<100;g++){
			Scanner input=new Scanner(System.in);
			System.out.println("\n请输入年份：");
			int year=input.nextInt();
			System.out.println("请输入月份：");
			int month=input.nextInt();
			int sum=0;
			int k=0;
			for(int i=1;i<=month-1;i++){
				if(i==2){
					if(year%4==0&&year%100!=0||year%400==0){
						sum=sum+29;
						
					}else{
						sum=sum+28;
					}
					
				}else{
					if(i==4||i==6||i==9||i==11){
						sum=sum+30;
						
					}else{
						sum=sum+31;
					}
				}
				
			}
			for(int a=1900;a<=year-1;a++){
				if(a%4==0&&a%100!=0||a%400==0){
					sum=sum+366;
				}else{
					sum+=365;
				}
				
			}
			sum+=1;
			int weekday=sum%7;
			System.out.println("日\t一\t二\t三\t四\t五\t六");
				for(int j=1;j<=weekday;j++){
					System.out.print("\t");
				}
				if(year%4==0&&year%100!=0||year%400==0){
					if(month==2){
						k=29;
						
					}else if(month==4||month==6||month==9||month==11){
						k=30;
						
					}else{
						k=31;
					}
					
				}else{
					if(month==2){
						k=28;
					}else if(month==4||month==6||month==9||month==11){
						k=30;
					}else{
						k=31;
					}
				}
				for(int i=1;i<=k;i++){
					if(sum%7==6){
						System.out.print(i+"\n");
						
					}else{
						System.out.print(i+"\t");
					}
					sum++;
				}
		}

效果图：